How to convert String and perform calculation in Swift? [closed]

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I advise you to read the Apple docs at developer.apple.com

 "I have 67+89.06 Dollars."
   // In order to get a Float value both operands need to be of type Float. 
     let valueCalculate = "I have \(Float(67) +   Float((89.06))) Dollars"
print(valueCalculate)

// Convert String to Int
 var stringNumber = "123456"
  var convertToInt = Int(stringNumber)

 // Convert Float value to Int
   var stringNumber = "123456"
    var convertToInt = Int(stringNumber)

  //convert value of type Float written as a String to Float
     var stringWithFloatValue = "123.250"
     var stringtoFloatValue = Float(stringWithFloatValue)

    //convert Float value to Int
    if stringtoFloatValue != nil {
       let floatToInt = Int(stringtoFloatValue!)
 }

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